The reason is simple: they were using Twitter when it was publicly readable and had RSS, and they have no selfish reason to stop. (Selfless reasons don't count, everybody is selfish)
The reason is simple: they were using Twitter when it was publicly readable and had RSS, and they have no selfish reason to stop. (Selfless reasons don't count, everybody is selfish)
Well if they want their posts to be readable they do have a selfish reason.